Dartboard, dart scoring device and dart scoring method

ABSTRACT

The disclosure provides a dartboard, a dart scoring device and a dart scoring method. The dartboard comprises a target board body; and a projection device disposed on the target board body and configured to project a target image around a periphery of the target board body to form a virtual target. The target board body according to the disclosure has a small size and is convenient to carry and use.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Chinese Patent Application No. 201710764117.0 filed on Aug. 30, 2017, which is hereby incorporated by reference herein in its entirety.

FIELD

The present disclosure relates to the technical field of entertainment devices, and in particular to a dartboard, a dart scoring device, and a dart scoring method.

BACKGROUND

Dart sport has already become one of popular activities of modern sports competitions and entertainments. Therefore, there is always a demand for technical improvements in dartboard equipment. In order to satisfy with the costumers' constant demands for chasing new and varied products in the market, various dartboard equipments must improve accuracy, convenience, and quality accordingly.

An existing dartboard is directly hung on the wall when in use, and thus it can occupy a large area and be inconvenient to carry. Although a collapsible dartboard has been available, the collapsible dartboard needs to be unfolded, which is inconvenient in use.

In addition, when the existing dart apparatus is in use, a user is usually required to determine which parts of dartboard the darts fall into by himself or herself and manually calculates his or her deserved scores. Therefore, the scoring is slow and inconvenient in use. Due to the complexity of the scoring rule of the darts, scoring errors often result from manual scoring.

SUMMARY

Directing to the above deficiencies in the prior art, the disclosure provides a dartboard, a dart scoring device and a dart scoring method.

According to the first aspect of the disclosure, there is provided a dartboard, comprising a target board body; and a projection device, disposed on the target board body and configured to project a target image around a periphery of the target board body.

The dartboard further comprises a first control device, configured to calculate a score based on positional information of a dart and a predefined scoring rule; and a detection device, configured to detect the positional information of the dart and to send the positional information to the first control device.

In an exemplary embodiment of the disclosure, the target board body is in a circular shape, the dartboard includes a plurality of detection devices each of which is disposed on a circumference of the target board body and each of which is configured to detect a distance between the dart and the respective detection device and send a detection device identifier and a distance detection value to the first control device, and the first control device is configured to calculate a score based on the detection device identifier and the distance detection value sent from the plurality of detection devices and the predefined scoring rule.

In an exemplary embodiment of the disclosure, the first control device is configured to determine a minimum distance detection value and a detection device identifier corresponding to the minimum distance detection value, or a minimum distance detection value and a maximum distance detection value and the detection device identifiers corresponding to the minimum and maximum distance detection values; determine a position of the detection device according to the detection device identifier, and calculate a distance between the dart and a centre of the target board body according to the position of the detection device and a predefined radius of the target board body; and calculate a score based on the distance between the dart and the centre of the target board body, the detection device identifier, and the predefined scoring rule.

In an exemplary embodiment of the disclosure, the first control device is configured to judge whether a distance between the dart and a centre of the target board body is greater than a predefined target radius, wherein if the distance between the dart and the centre of the target board body is greater than the predefined target radius, a score of zero is recorded; if the distance between the dart and the centre of the target board body is less than or equal to the predefined target radius, a score is calculated based on the detection device identifier and the distance detection value from each of the detection devices and the predefined scoring rule.

In an exemplary embodiment of the disclosure, the dartboard further comprises: a first fixing device, disposed on the target board body and configured to fix the target board body.

In the dartboard according to the embodiments of the disclosure, the target board body is provided with the projection device capable of projecting the target image around the periphery of the target board body to form a virtual target. Therefore the target board body has a small size, and is convenient to carry, transport and use.

According to the second aspect of the disclosure, there is further provided a dart scoring device comprising a dart and the dartboard as set forth above.

In an exemplary embodiment of the disclosure, the dart comprises: a dart body; a second control device; a second signal transceiver, disposed on the dart body to transmit a signal which includes a dart identifier and a user identifier; and a button, disposed on the dart body for setting a user, wherein the dartboard further includes a first signal transceiver, disposed on the target board body, and configured to receive the signal transmitted from the second signal transceiver, and wherein the first control device is configured to calculate a score of the user corresponding to the user identifier according to the dart identifier and the user identifier received by the first signal transceiver.

In an exemplary embodiment of the disclosure, the button is further configured to set a respective color for the user; the dart further includes an indicator light disposed on the dart body and capable of displaying a plurality of colors; and the second control device is disposed on the dart body and is configured to instruct the indicator light to display the color set by the user.

In an exemplary embodiment of the disclosure, the first signal transceiver is further configured to return a response signal to the second signal transceiver upon receiving the signal transmitted from the second signal transceiver; the second signal transceiver is further configured to receive the response signal transmitted from the first signal transceiver; and the second control device is further configured to control the second signal transceiver to stop transmitting the signal when the second signal transceiver receives the response signal.

In an exemplary embodiment of the disclosure, the dart includes a second fixing device, configured to be detachably connected to the dart body and to attach the dart on a flat surface where the target board body is located.

According to the third aspect of the disclosure, there is further provided a dart scoring method, comprising:

In an exemplary embodiment of the disclosure, detecting, by each of detection devices, positional information of a dart and sending the positional information to a first control device; and calculating a score by the first control device according to the positional information and a predefined scoring rule.

In an exemplary embodiment of the disclosure, the step of detecting, by each of detection devices, positional information of a dart comprises: detecting, by each of detection devices, a distance between the dart and the detection device and sending a detection device identifier and a distance detection value to the first control device, and the step of calculating a score by the first control device based on the positional information and a predefined scoring rule comprises: calculating the score by the first control device based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule.

In an exemplary embodiment of the disclosure, the step of calculating the score by the first control device based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule comprises: determining, by the first control device, a minimum distance detection value and a detection device identifier corresponding to the minimum distance detection value, or a minimum distance detection value and a maximum distance detection value and the detection device identifiers corresponding to the minimum and maximum distance detection values; determining, by the first control device, a position of the detection device according to the detection device identifier, and calculating a distance between the dart and a centre of the target board body according to the position of the detection device and a predefined radius of the target board body; and calculating, by the first control device, the score based on the distance between the dart and the centre of the target board body, the detection device identifier, and the predefined scoring rule.

In an exemplary embodiment of the disclosure, the step of calculating the score by the first control device based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule comprises: judging, by the first control device, whether a distance between the dart and a centre of the target board body is greater than a predefined target radius, wherein if the distance between the dart and the centre of the target board body is greater than the target radius, a score of zero is recorded; if the distance between the dart and the centre of the target board body is less than or equal to the target radius, the score is calculated based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a is a schematic structural diagram showing a dartboard according to the present disclosure;

FIG. 1b is a schematic structural diagram showing a dartboard according to the present disclosure;

FIG. 1c is a schematic diagram showing a projected target image of the dartboard according to the present disclosure;

FIG. 2a is a schematic structural diagram of a dart according to the present disclosure;

FIG. 2b is a schematic cross-sectional view of the dart according to the present disclosure;

FIG. 3 is a schematic structural diagram of a dart scoring device according to the present disclosure;

FIGS. 4a to 4c are schematic diagrams of a landing point of the dart;

FIG. 4d is a schematic diagram showing a position of the dart and a centre of the dartboard in FIG. 4c ; and

FIG. 5 is a schematic flow chart of a dart scoring method according to the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter clear and complete description of the technical solutions in the present disclosure will be provided with reference to the accompanying drawings of this disclosure. Obviously, the described embodiments are a part of, rather than all, the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of the present disclosure.

With reference to FIG. 1a , FIG. 1b , and FIG. 1c , an embodiment of the present disclosure provides a dartboard 1 including a target board body 11 and a projection device 12. The projection device 12 is disposed on the target board body 11 to project a target image 18 around a periphery of the target board body 11.

In an optional embodiment, as shown in FIG. 1c , the target image 18 is a virtual image projected by the projection device 12. The target image 18 is in a circular shape and is equally divided into 20 fan-shaped regions in relation to the centre of the circle. A centre angle of each region is 18°. Each fan-shaped region corresponds to a different basic score. The basic score of each fan-shaped region is shown outside the corresponding fan-shaped region. The target image 18 is further divided into an inner ring area 181 and an outer ring area 182 according to the size of the radius, wherein the inner ring area 181 is a triple area and the outer ring area 182 is a double area. If the dart falls within the inner ring area 181, a score that is three times the basic score corresponding to the fan-shaped area will be deserved. If the dart falls within the outer ring region 182, a score that is twice the basic score corresponding to the fan-shaped region will be deserved. If the dart falls within an area between the inner ring area 181 and the outer ring area 182, a score that is equal to the basic score corresponding to the fan-shaped region will be deserved.

The dartboard 1 according to the present disclosure, the projection device 12 is disposed on the target board body 11 and can project the target image 18 toward the outer periphery of the target board body 11 to form a virtual target. Therefore, the target board body 11 can have a small size and is easy to carry and use.

In an exemplary embodiment of the present disclosure, a laser projection device may be used as the projection device 12.

Further, the dartboard 1 may further include a first control device 19 and a detection device 13. The first control device 19 stores a predefined scoring rule. The scoring rule includes a corresponding relation between positional information and scoring of the dart 2.

The detection device 13 is configured to detect the positional information of the dart 2. In practice, the detection device 13 can calculate the position where the dart falls within the virtual target and send the positional information to the first control device 19. The first control device 19 is configured to calculate a score based on the positional information and a predefined scoring rule.

In one example, the target board body 11 includes a housing within which the first control device 19 and projection device 12 are located. The first control device may include a processor, such as a PLC (Programmable Logic Controller).

The dartboard of the present disclosure detects the positional information of the dart 2 by the detection device 13, and the first control device calculates the scores according to the positional information and the predefined scoring rule. After a user throws the dart 2, the dartboard 1 can automatically calculate the scores, thereby improving the scoring speed and accuracy. Therefore, the dartboard of the present disclosure is easy to use and provides reliability of the scoring.

It should be noted that the first control device may also send the calculated scores to other equipment. The equipment may include a mobile terminal (for example, a mobile phone, a PAD, etc.) or a display device, etc. to facilitate the user to know the score.

The dartboard 1 also includes a switch 17, which is provided on the target board body 11 for controlling the projection device 12 and the first control device to open or close.

In one example, as shown in FIG. 1a , the target board body 11 is in a circular shape. The dartboard 1 includes a plurality of detection devices 13 which are disposed on a circumference of the target board body 11. In an exemplary embodiment of the present disclosure, the plurality of detection devices 13 are uniformly distributed on the outer edge of the target board body 11. In the embodiment of the present disclosure, the detection device 13 includes an ultrasonic distance meter, a detection range of which covers the target image 18 projected by the projection device 12. As shown in FIG. 1c , when the dartboard 1 is installed in the work area and the switch 17 is turned on, the plurality of detection devices 13 uniformly arranged emit ultrasonic waves from the periphery of the target board body 11 in a radial manner to detect a distance from the dart 2 falling within the target image 18 from the corresponding detection device 13, and send the detection device identifier and the distance detection value to the first control device. It will be understood that in addition to the ultrasonic distance meter, the detection device 13 may include an infrared distance meter, a laser distance meter, or any other suitable distance meter.

The first control device is specifically configured to calculate the scores based on detection device identifiers and distance detection values sent from the plurality of detection devices 13 and a predefined scoring rule.

Since the plurality of detection devices 13 are provided, each detection device 13 can detect the distance between the dart 2 and the detection device 13. Therefore, the first control device may need to determine the position of the dart 2 according to the distance detection value detected by the detection device 13. The first control device stores the correspondence relationship between each of the detection device identifiers and its respective position. As shown in FIG. 1c , in an exemplary embodiment of the present disclosure, the number of detection devices 13 may be equal to the number of fan-shaped regions divided in the target image 18, where one of fan-shaped regions corresponds to a corresponding one of the detection devices 13. For example, a fan-shaped region with a basic score of 10 points may correspond to a detection device 13 identified as 001, a fan-shaped region with a basic score of 15 points may correspond to a detection device 13 identified as 002, and so on.

It should be noted that the target board body 11 may also be provided with a mounting mark. The mounting mark may correspond to a fan-shaped region with a basic score of 10 points. When the target board body 11 is mounted, the target image 18 as shown in FIG. 1c can be obtained as long as the mounting mark is located directly above the target board body 11.

In one example, the first control device is configured to determine a minimum distance detection value and a detection device identifier corresponding to the minimum distance detection value, or a minimum distance detection value and a maximum distance detection value and the detection device identifiers corresponding to the minimum and maximum distance detection values; determine a position of the detection device 13 according to the detection device identifier, and calculate a distance between the dart 2 and a centre of the target board body 11 according to the position of the detection device 13 and a predefined radius of the target board body 11; and calculate a score based on the distance between the dart 2 and the centre of the target board body 11, the detection device identifier, and the predefined scoring rule.

The calculation method of the distance between the dart 2 and the centre of the target board body 11 when the dart 2 falls into different positions will be described in detail with reference to FIGS. 4a to 4 d.

As shown in FIG. 4a , when one of the detection devices 13 detects the minimum distance detection value L₁ and two of the detection devices 13 detect the second lowest distance detection value L₁′, the dart 2 is positioned on an extension line of a connection of the centre A of the target board body 11 to the detection device 13 detecting the minimum value at this time. The distance between the dart 2 and the centre A of the target board body 11 is equal to L=r+L₁, where r is a radius of the target board body 11.

As shown in FIG. 4b , when two of the detection devices 13 detect the minimum distance detection value L₁, the dart 2 are positioned on an extension line of a connection of the centre A of the target board body 11 to a midpoint of the two detection devices 13. The distance between the dart 2 and the centre A of the dartboard body 11 is equal to

${L = {{r\; \cos \frac{\alpha}{2}} + \sqrt{L_{1} - \left( {r\; \sin \frac{\alpha}{2}} \right)^{2}}}},$

where α is an included angle between connecting lines of the two detection devices 13 to the centre, and r is the radius of the dartboard body 11.

As shown in FIG. 4c , when one of the detection devices 13 detects the minimum distance detection value L₁ and one of the detection devices 13 detects the maximum distance detection value L₂, the detection devices 13, the centre A of the target board body 11 and the dart 2 are positioned as shown in FIG. 4d , in which the detection device 13 detecting the value L₁ corresponds to a point C, and the detection device 13 detecting the value L₂ corresponds to a point B. The distance between the dart 2 and the centre A of the target board body 11 is equal to L=√{square root over (r²+L₁ ²−2rL₁ cos(α₁+α₂))}, where α₁ is an included angle between a connecting line of the centre of the target board body 11 to the detection device 13 detecting the minimum value and a connecting line of the detection device 13 detecting the minimum value to the detection device 13 detecting the maximum value and α₁ is constant value (α₁ can be determined once the position of the detection device 13 is fixed); α₂ is an included angle between a connecting line of the detection device 13 detecting the maximum value to the detection device 13 detecting the minimum value (i.e., BC) and a connecting line of the detection device 13 detecting the minimum value to a landing point of the dart 2.

${\alpha_{2} = {{arc}\; \cos \frac{L^{\prime} + L_{1}^{2} - L_{2}^{2}}{2\; L^{\prime}L_{1}}}},$

where L′ is a length of BC and is a constant value. As shown, L′ is a distance between the above-described two detection devices 13. Once the position of each detection device 13 is determined, L′ can be determined.

It should be noted that, in the embodiment of the present disclosure, if the dart 2 falls onto the target board body 11, no score will be recorded. According to the scoring rule of darts, if the dart 2 does not fall within the target range (i.e., outside the outer ring area 182), no score will be recorded. Therefore, the dartboard 1 also needs to judge whether the dart 2 falls within the target range for the scoring statistics.

In one example, the first control device is specifically configured to judge whether a distance between the dart 2 and the centre of the target board body 11 is greater than a predefined target radius, wherein if the distance between the dart and the centre of the target board body is greater than the predefined target radius, a score of zero is recorded; if the distance between the dart 2 and the centre of the target board body 11 is less than or equal to the target radius, a score is calculated based on the detection device identifier and the distance detection value sent from each of the detection devices 13 and the predefined scoring rule.

As shown in FIG. 1b , the dartboard 1 further includes a first fixing device 14 for fixing the target board body 11. The first fixing device 14 is disposed on the target board body 11. In one example, the dartboard 1 is vertically fixed on a flat surface in use, and the first fixing device 14 is disposed on a first surface of the target board body 11 (i.e., the surface that is in contact with the flat surface). In the embodiment of the disclosure, the first fixing device 14 is used to adhere and fix the target board body 11. In an exemplary embodiment of the present disclosure, the first fixing device 14 may employ an adhesive. It should be noted that the first fixing device 14 may also be a hook or the like. Any suitable fixing means capable of fixing the target board body 11 on a vertical flat surface are within the protection scope of the present disclosure.

Further, as shown in FIG. 1a , the dartboard 1 may further include a charging socket 15 disposed on the circumference of the target board body 11 between adjacent two detection devices 13. In an exemplary embodiment of the present disclosure, the charging socket 15 may include a USB interface. The charging socket 15 is provided to facilitate supplying power to the battery within the dartboard 1 such that the battery can supply power to the projection device 12, the detection devices 13 and the first control device 19.

An embodiment of the present disclosure further provides a dart scoring device. As shown in FIG. 3, the dart scoring device includes a dart 2 and a dartboard 1 as described above. Optionally, the dartboard scoring device may further include a dart barrel 3 for accommodating darts 2. In an exemplary embodiment of the present disclosure, the dart barrel 3 has a cylindrical shape, and the diameter of the dartboard 1 matches the diameter of the dart barrel 3. In this way, the dartboard 1 can be engaged with the dart barrel 3 as a top cover, and forms a closed accommodation space with the dart barrel 3 to prevent the darts 2 from falling. As such, the dart scoring device according to the present disclosure is easy to carry and use.

As shown in FIG. 1b , the dartboard 1 may further include a first signal transceiver 16 disposed on a second surface of the target board body 11. The second surface of the target board body 11 faces the user and is arranged opposite to the first surface.

As shown in FIG. 2, the dart 2 includes: a dart body 21; a second control device 29; a second signal transceiver 22 disposed on the dart body 21 to transmit a signal which includes a dart identifier and user identifier; and a button 23 disposed on the dart body 21 for setting a user.

As shown in FIG. 1b , the dartboard 1 further includes a first signal transceiver 16 disposed on the target board body 11 to receive the signal transmitted from the second signal transceiver 22. In an exemplary embodiment of the present disclosure, the first signal transceiver 16 and the second signal transceiver 22 may include a radio frequency device for receiving and transmitting a radio frequency signal.

The first control device is specifically configured to calculate a user's score corresponding to the user identifier according to the dart identifier and the user identifier received by the first signal transceiver 16.

In an embodiment of the present disclosure, dart 2 may directly send the user identifier. In this way, the first signal transceiver 16 of the dartboard 1 may send the received user identifier to the first control device 19 such that the first control device knows the user of this dart. It should be noted that the dart 2 may also send RF signals of different frequencies via the second signal transceiver 22 to distinguish different users. The first signal transceiver 16 of the dartboard 1 may identify the frequencies of the signals, and send the frequencies of the signals to the first control device 19. The first control device stores a correspondence relationship between the frequency and the user's identifier, such that the user corresponding to the frequency can be determined.

The setting of the user can be completed by operating the button 23 on the dart body 21 of the dart 2, and information can be exchanged via the second signal transceiver 22 on the dart body 21 and the first signal transceiver 16 on the target board body 11. In this way, the dartboard 1 can automatically recognize the different users and individually record the scores for the different users, thereby increasing entertainment and practicality.

Further, the button 23 is further configured to set a respective color for the user. As shown in FIG. 2a , the dart 2 further includes an indicator light 24 capable of displaying a plurality of colors. The indicator light 24 (in one example, an LED light) is disposed on the dart body 21. The second control device is disposed on the dart body 21 and is configured to instruct the indicator light 24 to display one of colors set by the user.

With the provision of the indicator light 24 on the dart body 21, respective colors of the indicator light 24 can be set by the different users. In this way, the different users may use the respective indicator colors to directly understand the current throwing situation of different users, which is convenient for the use.

In order to save power, after the first signal transceiver 16 receives its transmitted signal, the second signal transceiver 22 stops sending signals.

In one example, the first signal transceiver 16 is further configured to return a response signal to the second signal transceiver 22 upon receiving the signal transmitted from the second signal transceiver 22. The second signal transceiver 22 is further configured to receive the response signal transmitted from the first signal transceiver 16.

The second control device 29 is further configured to control the second signal transceiver 22 to stop transmitting the signal (i.e., dartboard identifier and user identifier) when the second signal transceiver 22 receives the response signal.

Once the dartboard 1 receives the signal transmitted from the dart 2, it can return the response signal to the dart 2. In this way, the dart 2 no longer sends the signal and the power of the dart 2 can be saved to ensure that sufficient power can be supplied to the indicator light 24.

Further, as shown in FIG. 2a and FIG. 2b , the dart 2 further includes a second fixing device 25. The second fixing device 25 is disposed at a leading end of the dart body 21 and is configured to be detachably connected to the dart body 21 to attach the dart 2 on a flat surface where the target board body 11 is located. In the embodiment of the present disclosure, the second fixing device 25 includes an adhesive and is screwed to the dart body 21.

The dart 2 may further include a dart wing 26 that is disposed at a tailing end of the dart body 21 to keep the dart 2 stable when in the air. As shown in FIG. 2b , the dart body 21 of the dart 2 is also provided with a battery 27 and a power supply line 28. The power supply line 28 is arranged along the dart body 21. The battery 27 can supply power to the second signal transceiver 22, the button 23, and the indicator light 24.

There is also provided a dart scoring method according to an embodiment of the present disclosure. As shown in FIG. 5, the method includes a step of:

Step 51, detecting, by each of detection devices, positional information of a dart and sending the positional information to a first control device 19.

In one example, each of the detection devices 13 can detect a distance between the dart 2 and this detection device 13 and send a detection device identifier and a distance detection value to the first control device 19.

The dart scoring method further includes a step of:

Step 52, calculating a score by the first control device 19 based on the positional information and a predefined scoring rule.

In one example, the first control device 19 calculates the score based on the detection device identifier and the distance detection value sent from each of the detection devices 13 and the predefined scoring rule. In one example, the step of calculating the score by the first control device 19 according to the detection device identifier and the distance detection value sent from each of the detection devices 13 and the predefined scoring rule specifically includes:

determining a minimum distance detection value and a detection device identifier corresponding to the minimum distance detection value, or a minimum distance detection value and a maximum distance detection value and the detection device identifiers corresponding to the minimum and maximum distance detection values; determining a position of the detection device according to the detection device identifier, calculating the distance between the dart and a centre of the target board body according to the position of the detection device and a predefined radius of the target board body 11; and calculating the score based on the distance between the dart 2 and the centre of the target board body 11, the detection device identifier, and the predefined scoring rule.

It can be seen from step 51 to step 52 that each of the detection devices 13 can detect the positional information of dart 2, and the first control device 19 can calculate the score according to the positional information of the detection device 13 and the predefined scoring rule; once the user throws a dart, the dart scoring device can automatically calculate a score, thereby improving the scoring speed and accuracy. In this manner, the dart scoring method according to the present disclosure is convenient to use and improves the reliability of the scoring.

According to the scoring rule of darts, if the dart 2 does not fall within the target range, no score will be recorded. Therefore, the dartboard 1 also needs to judge whether the dart 2 falls within the target range for the scoring statistics.

Therefore, prior to Step 52, the method further includes a step of:

Step 51′, judging, by the first control device, whether a distance between the dart and a centre of the target board body is greater than a predefined target radius, wherein if the distance between the dart and the centre of the target board body is greater than the target radius, a score of zero is recorded; if the distance between the dart and the centre of the target board body is less than or equal to the target radius, and step 52 is performed.

The method further includes a step of: counting, by the first control device 19, a number of darts of each user according to the signal received by the first signal transceiver.

In one example, the signal includes a dart identifier and a user identifier. The first control device 19 counts a total number of darts of the respective user according to the user identifier.

It should be noted that the execution order of the Step 51′ and the step of the scoring statistics (i.e., Step 52) is not limited, and they can also be executed synchronously.

Further, after the step of the scoring statistics (i.e., Step 52) is completed, the method may further include steps of:

Step 53: when the first detection device detects a removal of a dart, sending an instruction to the first control device, and decreasing, by the first control device 19, the number of darts of the corresponding user by one according to the instruction; and

Step 54: judging, by the first control device 19, whether the number of darts of each user is zero within a predefined period of time, wherein if the number of darts of each user is zero within the predefined period of time, the process ends; if the number of darts of at least one user is not zero within the predefined period of time, Step 55 will be performed.

In one example, if the number of darts of each user is zero within a predefined period of time, it means that the darts 2 are removed at this time, and the process ends. If the number of darts of at least one of the users is not zero, it means that there are a dart 2 that has still not been removed, and then the dart 2 that has not been removed can be instructed to provide a prompt.

The method may further include: Step 55, instructing, by the first control device 19, a dart that has not been removed to provide a prompt.

In one example, the first control device may instruct the first signal transceiver 16 to send a control instruction. After the second signal transceiver 22 of the dart 2 that has not been removed receives the control instruction, the second control device 29 of the dart 2 instructs its indicator light 24 to flash so as to prompt the user to remove the dart 2 in time.

It can be understood that the above embodiments are merely exemplary embodiments adopted for explaining the principle of the present disclosure. However, the present disclosure is not limited thereto. For a person having ordinary skill in the art, various variations and improvements may be made without departing from the spirit and essence of the present disclosure. These variations and improvements are also considered to be within the protection scope of the present disclosure. 

What is claimed is:
 1. A dartboard, comprising: a target board body; and a projection device, disposed on the target board body and configured to project a target image around a periphery of the target board body.
 2. The dartboard according to claim 1, further comprising: a first control device, configured to calculate a score based on positional information of a dart and a predefined scoring rule; and a detection device, configured to detect the positional information of the dart and to send the positional information to the first control device.
 3. The dartboard according to claim 2, wherein the target board body is in a circular shape, the dartboard includes a plurality of detection devices each of which is disposed on a circumference of the target board body and each of which is configured to detect a distance between the dart and the respective detection device and send a detection device identifier and a distance detection value to the first control device, and the first control device is configured to calculate a score based on the detection device identifier and the distance detection value sent from the plurality of detection devices and the predefined scoring rule.
 4. The dartboard according to claim 3, wherein the first control device is configured to determine a minimum distance detection value and a detection device identifier corresponding to the minimum distance detection value, or a minimum distance detection value and a maximum distance detection value and the detection device identifiers corresponding to the minimum and maximum distance detection values; determine a position of the detection device according to the detection device identifier, and calculate a distance between the dart and a centre of the target board body according to the position of the detection device and a predefined radius of the target board body; and calculate a score based on the distance between the dart and the centre of the target board body, the detection device identifier, and the predefined scoring rule.
 5. The dartboard according to claim 3, wherein the first control device is configured to judge whether a distance between the dart and a centre of the target board body is greater than a predefined target radius, wherein if the distance between the dart and the centre of the target board body is greater than the predefined target radius, a score of zero is recorded; if the distance between the dart and the centre of the target board body is less than or equal to the predefined target radius, a score is calculated based on the detection device identifier and the distance detection value from each of the detection devices and the predefined scoring rule.
 6. The dartboard according to claim 1, further comprising: a first fixing device, disposed on the target board body and configured to fix the target board body.
 7. A dart scoring device comprising a dart and a dartboard, the dartboard including: a target board body; and a projection device, disposed on the target board body and configured to project a target image around a periphery of the target board body.
 8. The dart scoring device according to claim 7, wherein the dart comprises: a dart body; a second control device; a second signal transceiver, disposed on the dart body to transmit a signal which includes a dart identifier and a user identifier; and a button, disposed on the dart body for setting a user, wherein the dartboard further includes a first signal transceiver, disposed on the target board body to receive the signal transmitted from the second signal transceiver, and wherein the first control device is configured to calculate a score of the user corresponding to the user identifier according to the dart identifier and the user identifier received by the first signal transceiver.
 9. The dart scoring device according to claim 8, wherein the button is further configured to set a respective color for the user; the dart further includes an indicator light disposed on the dart body and capable of displaying a plurality of colors; and the second control device is disposed on the dart body and is configured to instruct the indicator light to display the color set by the user.
 10. The dart scoring device according to claim 8, wherein the first signal transceiver is further configured to return a response signal to the second signal transceiver upon receiving the signal transmitted from the second signal transceiver; the second signal transceiver is further configured to receive the response signal transmitted from the first signal transceiver; and the second control device is further configured to control the second signal transceiver to stop transmitting the signal when the second signal transceiver receives the response signal.
 11. The dart scoring device according to claim 7, wherein the dart includes a second fixing device, configured to be detachably connected to the dart body and to attach the dart on a flat surface where the target board body is located.
 12. The dart scoring device according to claim 8, wherein the dart includes a second fixing device, configured to be detachably connected to the dart body and to attach the dart on a flat surface where the target board body is located.
 13. The dart scoring device according to claim 9, wherein the dart includes a second fixing device, configured to be detachably connected to the dart body and to attach the dart on a flat surface where the target board body is located.
 14. The dart scoring device according to claim 10, wherein the dart includes a second fixing device, configured to be detachably connected to the dart body and to attach the dart on a flat surface where the target board body is located.
 15. A dart scoring method, comprising: detecting, by each of detection devices, positional information of a dart and sending the positional information to a first control device; and calculating a score by the first control device according to the positional information and a predefined scoring rule.
 16. The method according to claim 15, wherein the step of detecting, by each of detection devices, positional information of a dart comprises: detecting, by each of detection devices, a distance between the dart and the detection device and sending a detection device identifier and a distance detection value to the first control device, and wherein the step of calculating a score by the first control device based on the positional information and a predefined scoring rule comprises: calculating the score by the first control device based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule.
 17. The method according to claim 16, wherein the step of calculating the score by the first control device based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule comprises: determining, by the first control device, a minimum distance detection value and a detection device identifier corresponding to the minimum distance detection value, or a minimum distance detection value and a maximum distance detection value and the detection device identifiers corresponding to the minimum and maximum distance detection values; determining, by the first control device, a position of the detection device according to the detection device identifier, and calculating a distance between the dart and a centre of the target board body according to the position of the detection device and a predefined radius of the target board body; and calculating, by the first control device, the score based on the distance between the dart and the centre of the target board body, the detection device identifier, and the predefined scoring rule.
 18. The method according to claim 16, wherein the step of calculating the score by the first control device based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule comprises: judging, by the first control device, whether a distance between the dart and a centre of the target board body is greater than a predefined target radius, wherein if the distance between the dart and the centre of the target board body is greater than the target radius, a score of zero is recorded; if the distance between the dart and the centre of the target board body is less than or equal to the target radius, the score is calculated based on the detection device identifier and the distance detection value sent from each of the detection devices and the predefined scoring rule. 